Unintentional Trip

[Hawks Coach]

I understand that a player on the floor that another player then runs into does not necessarily cause a foul. I know that no contact is no foul, so the player falling while trying to avoid another player falling is just bad luck. and it seems that many of us agree that a player running behind another player who "trips" that player through fot-on-foot contact has committed a foul, and it should be called in a fast break situation where an opportunity is lost as a result. You may choose to ignore this in half court if you see no advantage gained, just a couple players falling.

How about this. A is dribbling p court, B is trailing, B trips over his own shoelace and falls into A's feet from behind directly causing A to fall and lose ball. It seems that some believe this is just two players falling over each other. I have a foul. Opinions?